Electric riveting device



W. 0. WENTWORTH CTRIC RIVETIN APPLICATION men ocr 10 G DEVIC'E.

ELE

PatentedJan. 17, 1922.

2 SHlzEl'S-SHEET W. O. WENTWORTH.

ELECTRiC 'mvmm; DEVICE. APPLICATION FILED OCT. 10, 1919.

2 SHhhTS-SHEET 2.

an uentoz Patented Jan. 17, 1922.

i150. Weizizoorih Uni [TED STATES PATENT OFFICE.

WILLIAM o. WENTWORTI-I, or new YORK, N. Y.

To all whom it may concern.

.Be it known that 1, WILLIAM O. WVENT- wonrri, a citizenof the United States, residing at New York, in the county of New York and .State of New York, have invented certain new .and useful Improvements in Electhe latter heated electrically to the proper temperature to' permit its upsetting by an electro-magnetically operated element constituting a component part of the device.

Other purposes and advantages of my invention are reduction of the number of workmen necessary in a riveting gang, avoidance of burning the rivet in heating with its obvious results, a more eflicient joint at the rivet connection, elimination of noise, increase in rapidity with which the rivets may be applied, elimination of strain on the workmen whereby the physical standard required for such work is lowered and the employment of cheaper labor rendered possible, and a material reduction in riveting cost.

I will describe my invention in the best form known to me at present and wherein I employ a movable solenoid core as the means for the upsetting of a heated rivet, but it should be understood that my invention is susceptible to changes in proportion and arrangement and to desirable additions with 'theexcrcise of only ordinary mechanical skill and without departing from the scope of my invention.

In the drawingschosen to illustrate my invention, the scope whereof is pointed out' in the claims Figures 1, 2, 3 and 4 are views illustrating successive steps in the use of my device;

..Fig. 5, a detail view of the advance end of the retarding bar of the dolly bar element of the device showing the heating circuit terminal carried thereby which is adapted to en age one end of the rivet;

Fig, 6, a detail view of the advance end of the solenoid core of the riveting or up setting element of "my device and showing the terminal of the heating circuit which engages the other end of the rivet;

Specification of Letters Patent.

other low resistance material.

Patented Jan. 1'7, 1922.

Application filed October 10, 1919. Serial No. 329,766.

Fig. 7, a detail view of a preferred construction of leg terminal for use in connection wlth both the dolly bar element and the riveting clement of the device;

Fig. 8, a diagrammatic view of the circuits which are controlled by the switches carried by the handle of the dolly bar elc' ment.

Fig. 9, a similar view in respect to the riveting element and the switches carried thereby; and Fig. 10, a diagrammatic view illustrative of the circuits employed in the use of the device.

The dolly bar element of my riveting de vice is indicated at A and the riveting or upsetting element at B. The former is substantially U-shaped to form the legs or arms 10 and 11 which constitute the cores of magnetswhose windings are indicated at 12 and 13 respectively. The arm connecting portion of the dolly bar element A is provided with passages 13 and 14, through which the windings 12 and 13 are led from a suitable source of electric supply controlled through the medium of switches carried by the dolly bar element and to be hereinafter referred to. The element A also includes a central retarding bar or butter 15 which is recessed at its outer end to receive the head of the rivet to be upset, said recess being indicated at 16. The base'of this recess 16 is further recessed at 17 and confined within the latter and insulated from the bar 15 is an electrical heating circuit terminal 18 of copper or Connected with this terminal 18 and extending laterally through the bar 15 and insulated therefrom is a binding post 19 whereby the terminal 18 may be conveniently connectedto a conductor of the heating circuit, such conductor being led through the passage 14 The outer ends of the arms 10 and 11 are provided with engaging feet 20 which have a rotatable bearing connection 21 with said arms whereby the feet may readily adjust themselves to the surface with which they are engaged. If desirable the engaging faces of the feet 20 canbe curved as shown at 22 in Fig. 7 and this for the purpose of increasing the'tract-ion between said feet and the metal plates being riveted. The shape of the apparatus may be varied for convenience in corner work.

The riveting or upsetting element of my device is also substantially U-shaped and inthe core of which is indicated at 28. The

outer end of the core 28 is recessed at 29 to receive the end of the rivet to be upset, al-

lowing for the desired shape of rivet whenfinished, and also carries an electrical heating circuit terminal 30 insulated from the core and adapted to engage the end. of the rivet. This terminal 30 is also made of cop- 'per or other low resistance material, and in this connection it is tobe noted that these copper insulated terminals are provided .for the purpose of preventing the other portlons of the removable elements, such as the retarding bar and the core 28, from heating up to any material degree and thus being deformed. A binding post 31. leads from the terminal 30 through the side of the core 28.

and is insulated from the latter, whereby said terminal may be easily connected up in the heating circuit. The engaging endsof the magnet cores 23 and 24 are also provided with feet 32 corresponding in every particular to the feet 20 on the engaging ends of the cores 10 and 11. The windings of the cores 23 and 24 and the solenoid 27 are led through passages 33 and 34 in the arm connecting portion of the element B and are thenconnected up with suitable switches carried by said elemcnt'and to be hereinafter referred to. The winding 12 of'the dolly bar element is connected to a switch 35 and ,the latter is connected by conductors 36 with feed line conductors 37 and 38,.whereby' the magnot formed bythe core 10 and winding 12 can be selectively energized or deenergizedQ The winding 13 of the element A is connected to a switch 39 and the latter is in turn connected to the feed line conductors 37 and 38 by conductors 40 whereby the magnet formed by the core 11 and winding 13 may be selectively energized and deenergized;

The terminal 18 is connected by a conductor 41 to one of the conductors 4201? a heating circuit feed line, while the other terminal 30 of the heating circuit is connected by a conductor to a switch 44 ca'rriedby the,

element B and which switch is in turn connected by a conductor 45 tothe other conductor 42 of the heatingcircuit feed line. Preferably I restrict thecontrol of the heating circuit to the workman who is 0 crating the riveting or upsetting element but, if desirable, an additional switch could be introduced into this circuit and mounted upon the element A so as'to bring the heating circuit within the control of either workman. The wind'ing 25 is connected "to a switch 46 and the latteris in turn connected to the feed wires 37 and 38 by conductors 47. The winding 27 of the solenoid is connected 1 to a switch 48 and the latter is in turn connected to the feed wires 37 and 38 by con- .ductors 49. The winding 26 of the core 24 is connected to a reversing switch 50 and the latter is in turn connected to the feed wires eflect just previous to the energization of the solenoid so as to magnetically maintain the elements of the'device in proper relation during theupsetting of the rivet. By doing this the magnetic'circuit is given a continuous path, with no air gap,.said magnetic circuit passing through the solenoid core 28, thus increasing the strength of the solenoid.

' It is to be noted that the retarding bar or buffer 15, and also the core 28 of the riveting element B,-are removably mounted, thus permitting these elements to be replaced by like elements of different design or type according to the class of work being done. This is also of importance in the event of breakageof either one of these elements, as a new one may be readily substituted for a broken or worn-out element.' 7 Screw plugs 52 are pro v vided, as shown, to form abutments for the elements 15, 28, and these plugs may be adjusted to suit the type of retarding bar or core being used for the character of the work being done.

In the use of my device only two workmen are necessary, one of whomI will call the helper and the other the riveter. =The first step .in the operation of .rivetin together theplates C and D, shown in Flgs. 1 to 4, inclusive, is performed by the helper who puts the rivet E in the alined holes provided in the plates C and D. The helper:

then places the dolly bar element A in the lfoa position shown in Fig. 1 and closes switches 35 and 39 to energize magnets formed by the cores 10 and 11 and the windings 12 and 13 when the magnetic flow will be in the'direction indicated by the arrows in Fig. 1. The

rijveter then 'putsthe upsetting element B in place, as shown in Fig. 2, and closes switches 46 and 50 to produce the magnetic flow shown by the arrows in Fig. 2., The riveter.

then closes the switch 44 of the heating circuit and heats the rivet E to the required temperature, after which this switch is.

opened. Following this the riveter'operates the switch 50 to reversethe magnetic flow in the core 24, as shownby the arrows in Fig. 3. This reversal of they magnetic flow 1n the core 24 serves to hold the elements of the device in proper relation and to increase the strength of the solenoid during the upsetting of the rivet E, which is then accom pli'shed by closing the switch 48 to operate the solenoid core 28 as shown in Fig. 4. The

operation of riveting is then complete and the various switches are opened and the ele ments in the device repositioned for upsetting the next rivet.

It is to further noted that in the operaticn of the core 28, said core tends to move so as to locate itself centrally in the coil of the solenoid 2'1, and as this force is decreased upon. the core nearing the center, the ma netic force of the two magnets, indicated ny 23, 2e, Ad 26, come into play as the air'gap is decreased, and thus the final force is ross the plate D to the core 28 to close this air-gap. These two forces 1 re employed during the i'ipsetting of the rivet.

I claim:

1. A riveting device comprising pair of independent magnets, means for energizing and (i6QI1l31""lZlIlg said magnets, a rivet holding member carried by one magnet, a. rivet upsetting device carried by the other magnet, and heating circuit terminals carried by the rivet holding men rhea and rivet upsetting device res tively and engageable respectively with the ends of a rivet.

2. A riveting device comprising a p independent man and deenergixin said magnets, a rivet hol member carried by one images", a rivet upsetting devie carried by he ot x r magnet, a. heating or uit, terminals in aid circuit carried b the rivetho din, member tively and vely with the ends of for opening end. closing l and rivet upsetin device engageable respec rivet, and means said circuit.

3. A riveting device comprising a. pair of independent magnets. means ioi energizing and deenergizing said magnets, a rivet holding member carried by one magnet, a. rivet upsetting device carried by the other magnet. a heating circuit. terminals in said circuit carried by the rivet holding member and rivet upsetting device respectively and engageable respectively with the ends of a rivet, and means carried by the magnet carrying the rivet-upsetting device for opening and closing the heating circuit.

4. In a riveting device, a iii-shaped member each leg of which forms a magnet, and engaging feet pivotally connected to the free ends of said leg respectively.

5. In a riveting device, a pair of independent ishaped members each leg of said members forming afmagnet, a rivet holding element carried by one member between its legs, a solenoid carried by the other member between its legs and whose core constitutes a rivet upsetting element,v meanscarried by each member for selectively controlling the (:nergization and deenergiza-tion of its associated magnets, means carried by the sole noid carrying member for cont-rolling the cncrgization and deenergization of said solenoid, a heating circuit, terminals insaid circuit carn respectively by the rivet holding element and the solenoid core and engag-cable with the ends of a rivet respectively, means on the solenold carrying member for opening and closing the heating cir' legs, and whose core constitutes a rivet upsetting element, means for controlling the encrgization and deenergization of said solenoid, and means for reversing the magnetic llovv of one of the magnets.

7. A riveting device comprising a pair of independent magnets, means for energizing and deenergining said magnets, a removable rivet holding member carried by one magnet, and a removable rivet upsetting device arried by the other magnet.

55. A riveting device comprising a pair of independent magnets, means for energizing and deenergizing said magnets, rivet holding member carried by one magnet, a rivet upsetting device carried by the other magnet, and adjustable abutments for said holding member and upsetting device.

9. in a riveting device, a- U-shaped member each leg of which forms a. magnet, means for selectively controlling the energization and deenergization of said magnets,'a solenoid carried by said member, and Whose core constitutes a rivet upsettingelement, means for controlling the energization and deencrgization of said solenoid, and means for reversing the magnetic flow of one of the magnets thereby permitting the magnetic circuit to pass through the solenoid core and thus increase the strength of said solenoid during its upsetting operation.

10. A riveting device comprisin a pair oi independent magnets, means "or energizing and deenergizing said magnets, a rivet net, a rivet upsetting device carried by the other magnet, and means associated with. one of the magnets for increasing the force of the upsetting device.

12. A riveting device comprising a pair ct independentmagnets means for enerher gizing end deenergizing said magnets, a, rivet holding member carried by one magnet, an electromagnetic upsetting device carried by the other magnet, and means associated with the magnet carrying the rivet upsetting device for increasing the force of said upsetting device. 13. A riveting device comprising a pair of independent magnets each-having aplurality of coils, a rivet holding member carried by one magnet, an electro-magnetically operated rivet upsetting device carried by the other magnet, and means associated with one coil of the magnet carrying the rivet upsetting device for reversing the polarity throngh the coil whereby the magnetic force through the rivet upsetting des'lce is increased.

14. In a riveting device, a U shaped 1ne1n-. each leg of which forms it magnet, t

between the noid carried by said Leas es rivet holding device carried by the member legs, and means carried by the member for selectively controlling the energization and deenergizationof the magnets.

15. In a riveting device,-a, U-sh'eped member each leg of which forms a magnet, means for selectivelycontrolling the ene-rgization and deenergization of said magnets, a solernember between its legs, and whose core'oonstitutes a rivet upsetting element, and means for controlling the energization and deenergizntion of said solenoi 4 In testimony whereof I'aflix my signature in vpresence of two witnesses.

Will-LIAM O- WENTWORTH, Witnesses SAUL Bunsen, MARGARET lV'enrWon'rH. 

